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(High Availability). , , . , , , , 2 20 . , , .
, (Fault Resiliency). , .
, (Fault Tolerance). , , , / . , . . .
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(Continuous Availability). , , . , (upgrade) on-line. . .
, (Disaster Tolerance) .. , - , . , , , , , . () , .
( ) :
mission critical -- , ;
business critical -- , ;
task critical -- , .